v.surf.rst v.surf.rst - Spatial approximation and topographic analysis using regularized spline with tension. Vector (v.*) ParameterVector|input|Input points layer|0|False ParameterString|where|WHERE conditions of SQL statement without 'where' keyword| ParameterRaster|maskmap|Name of the raster map used as mask|True ParameterTableField|zcolumn|Name of the attribute column with values to be used for approximation|input|-1|False ParameterNumber|tension|Tension parameter|None|None|40 ParameterNumber|segmax|Maximum number of points in a segment|None|None|40 ParameterNumber|npmin|Minimum number of points for approximation in a segment (>segmax)|None|None|300 ParameterNumber|dmin|Minimum distance between points (to remove almost identical points)|None|None|0.001 ParameterNumber|dmax|Maximum distance between points on isoline (to insert additional points)|None|None|2.5 ParameterNumber|zmult|Conversion factor for values used for approximation|None|None|1.0 ParameterNumber|theta|Anisotropy angle (in degrees counterclockwise from East)|0|360|0 ParameterNumber|scalex|Anisotropy scaling factor|None|None|0 ParameterBoolean|-t|Use scale dependent tension|False ParameterBoolean|-d|Output partial derivatives instead of topographic parameters|False OutputRaster|elev|Surface OutputRaster|slope|Slope OutputRaster|aspect|Aspect OutputRaster|pcurv|Profile curvature OutputRaster|tcurv|Tangential curvature OutputRaster|mcurv|Mean curvature